In this book, author analyzes the Ragozin variation of the Queen's gambit for the Black repertoire. The basic position arises (various move order is possible) after 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Bb4. Material is sorted into 6 main chapters: 1) lines with 5.Qa4+, or 5.Bg5 h6 6.Bxf6 and 7.Qa4+; 2) lines with 5.Qb3, or 5.Bg5 h6 6.Bxf6 and 7.Qb3; 3) 5.cxd5 exd5; 4) 5.Bg5 h6; 5) 5.e3 with transposition to the Nimzo-Indian; 6) so called Accelerated Ragozin 1.d4 d5 2.c4 e6 3.Nc3 Bb4. The book contains both analyzes and word explanations. Matthieu Cornette is GM with rating close to 2600, French champion 2016. He has already 10 years the Ragozin variation in his repertoire. Further information about the book and a sample are available at chess-evolution.com